普通模式下，选项卡活动时会高亮显示，但如果系统设置为高对比模式，则无法确定哪个选项卡页是活动的。
In normal mode, the TAB will be highlighted when active, but if the system is set to high contrast mode, there is no way to identify which TAB page is active.
普通模式下，选项卡活动时会高亮显示，但如果系统设置为高对比模式，则无法确定哪个选项卡页是活动的。
In normal mode, the TAB will be highlighted when active, but if the system is set to high contrast mode, there is no way to identify which TAB page is active.
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